Clld

~~~~~

- factored out DeclEnum and LGR_ABBRS to clldutils
- upgraded leaflet to version 1.0.3

~~~~~

Added shortcut config method to add simple template-based pages to clld apps.

~~~~~

Upgraded leaflet and leaflet-provider plugin.

~~~~~

Bugfixes:
- https://github.com/clld/clld/issues/108
- https://github.com/clld/clld/issues/109

~~~~~

fixing bugs in CLDF export.

~~~~~

Backwards incompatible changes:

- clld does no longer provide support for imeji metadata files.
- The test utilities have been refactored. For typical clld apps,
which used `TestWithEnv` and `TestWithApp` with `__setup_db__==False`
this should not change anything.